A. Job Interview
import sys
def solve():
input = sys.stdin.readline
mod = 10 ** 9 + 7
n = int(input().rstrip('\n'))
s = str(input().rstrip('\n'))
print("Yes" if s.count("x") == 0 and s.count("o") > 0 else "No")
if __name__ == '__main__':
solve()
B. Coloring Matrix
import sys
def solve():
input = sys.stdin.readline
mod = 10 ** 9 + 7
n = int(input().rstrip('\n'))
a = [list(map(int, input().rstrip('\n').split())) for _ in range(n)]
b = [list(map(int, input().rstrip('\n').split())) for _ in range(n)]
d0 = True
d90 = True
d180 = True
d270 = True
for i in range(n):
for j in range(n):
if a[i][j] == 1:
if b[i][j] != 1:
d0 = False
if a[-j-1][i] == 1:
if b[i][j] != 1:
d90 = False
if a[-i-1][-j-1] == 1:
if b[i][j] != 1:
d180 = False
if a[j][-i-1] == 1:
if b[i][j] != 1:
d270 = False
print("Yes" if max(d0, d90, d180, d270) else "No")
if __name__ == '__main__':
solve()
C. Cards Query Problem
import sys
import collections
def solve():
input = sys.stdin.readline
mod = 10 ** 9 + 7
n = int(input().rstrip('\n'))
q = int(input().rstrip('\n'))
box = collections.defaultdict(list)
card = collections.defaultdict(lambda: collections.defaultdict(int))
for i in range(q):
query = list(map(int, input().rstrip('\n').split()))
if query[0] == 1:
box[query[2]] += [query[1]]
card[query[1]][query[2]]
elif query[0] == 2:
print(*sorted(box[query[1]]))
elif query[0] == 3:
print(*sorted(card[query[1]].keys()))
if __name__ == '__main__':
solve()
D. Writing a Numeral
import sys
import collections
def solve():
input = sys.stdin.readline
mod = 998244353
q = int(input().rstrip('\n'))
ans = 1
dq = collections.deque([1])
for i in range(q):
query = list(map(int, input().rstrip('\n').split()))
if query[0] == 1:
ans = (ans * 10 + query[1]) % mod
dq.append(query[1])
elif query[0] == 2:
digit = len(dq) - 1
n = dq.popleft()
ans = (ans - (pow(10, digit, mod) * n) % mod) % mod
else:
print(ans)
if __name__ == '__main__':
solve()